Increase input padding. Minor ui fixes

app/assets/stylesheets/gitlab_bootstrap/blocks.scss

app/assets/stylesheets/gitlab_bootstrap/forms.scss

app/assets/stylesheets/sections/projects.scss

app/views/admin/hooks/index.html.haml

app/views/profiles/account.html.haml

app/views/profiles/keys/_form.html.haml

app/views/projects/deploy_keys/_form.html.haml

app/views/projects/hooks/index.html.haml

app/views/projects/new.html.haml

app/views/projects/wikis/_form.html.haml

app/views/projects/wikis/_new.html.haml